A form of silica. It basically cuts the little fuckers all to shit. They don't like it. It's a powder, sold as 'Dio'.
Works for most soft-bodied insects (earwigs, aphids, ants, etc.), and is organic. It can be spread around the plant in a circle the same way one might try to ward off evil spirits
. However after it rains you need to reapply, copper is better used this way. I apply it directly to the plant. All that said, I have only used Dio on plants like hostas and daisies, so I'm not sure of how it would affect your smoke if applied directly to the flowers.
Hope this helps.